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Message-ID: <015201c2ccc2$e10729e0$bcf627a0@zhengthinkpad>
From: "Haoqiang Zheng" <hzheng@cs.columbia.edu>
To: <ak@suse.de>
Cc: <linux-kernel@vger.kernel.org>
Subject: Re: linux hangs with printk on schedule()
Date: Tue, 4 Feb 2003 22:01:27 -0500
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> oops_in_progress++;
> printk(...);
> oops_in_progress--;

Thanks Robert and Andi for your help.
But the trick (avoid waking up klog by setting oops_in_progress) doesn't
seem to work for me.

I did notice the code:
*********************************************
 if (must_wake_klogd && !oops_in_progress)
  wake_up_interruptible(&log_wait);
*****************************************
But it simply still doesn't work. :-(

I am working on implementing a new SMP scheduler. It's an OS research
project. Without "printk" in the scheduler, it's really very hard to do the
debugging. I don't know how other guys do in this case. Are you guys better
equipped than me? I mean is debugging with gdb running on another machine
(connected via serial port) a common technique? I am not sure whether it's
necessary to set up an environment like that.

Haoqiang

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